diff --git a/util/time.c b/util/time.c
index e1bc2b5c..06e42b40 100644
--- a/util/time.c
+++ b/util/time.c
@@ -4,7 +4,7 @@
 
 #include "util/time.h"
 
-const long NSEC_PER_SEC = 1000000000;
+static const long NSEC_PER_SEC = 1000000000;
 
 int64_t timespec_to_msec(const struct timespec *a) {
 	return (int64_t)a->tv_sec * 1000 + a->tv_nsec / 1000000;